Sunrays falling on a concave mirror after reflection are allowed to fall on peice of paper.The paper start burning.What is the focal length of the mirror?
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You need to know the distance to the paper and this will be the focal length since the light rays are focussed to a point at this distance.
shauryasingh40:
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- Without the given numerical distance it can't be say.. But if we know the distance of focal length then it could be very easy for us
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